Walla Walla River Basin Fish Screens Evaluations. Annual Report, January 2006-December 2006

摘要

The Northwest Power and Conservation Council (NPCC) Columbia River Basin Fish and Wildlife Program lists fish protection through effective screening of irrigation diversions as an essential element in its plan to restore declining steelhead and salmon runs (NPPC 1984, 1987, 1994, 2000). Over the past 20 years, the Bonneville Power Administration (BPA) and the Council have expanded the screening efforts to include periodic site evaluations. The evaluation of existing screen sites is important to ensure that the sites continue to achieve the goals of protecting fish from entrainment and from harm within the screen facility itself. Criteria for the design of Phase II fish screen facilities were developed by the National Marine Fisheries Service (NMFS 1995). These criteria are used as guidelines in determining whether a site is constructed, operated, and maintained in a way that protects juvenile salmonids. The evaluations conducted for BPA by the Pacific Northwest National Laboratory (PNNL) and reported here focused on fish screen facilities at four sites in the Walla Walla River basin--two in southeastern Washington and two in northeastern Oregon.